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regular Expression validator in actionscript

Posted on 2010-11-23
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614 Views
Last Modified: 2013-11-11
Hello,

i have an application, containing a single item into which a certain regular expression can be entered..

<mx:Form>
                  <mx:FormItem label="validate:">
                        <s:TextInput id="dateBT" width="200" focusOut="dateTI_focusOutHandler(event)"/>
                  </mx:FormItem>
</mx:Form>

that is my view. the User Interface..

here is my declaration blck :

<fx:Declarations>
            <mx:RegExpValidator id="regVal" property="text" expression="{regExpr}"
                         flags="g"  source="{dateBT}" triggerEvent="focusOut"/>
      </fx:Declarations>

and i have var regExpr:String = "^\d{4}-(\d|0\d|1[012])-(\d|[012]\d|3[01]|today)$";

now, here is the test format:

aaaa22efe// not allowed
20100103 //YYYYMMDD not allowed
2010-01-03 //YYYY-MM-DD

so, only dates with the format YYYY-MM-DD should be validated ..as it is now, my code invalidates all three formats..i don't know what the problem could be..anybody with a clue please let me know.

thanks
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Question by:admindesk
  • 2
5 Comments
 
LVL 35

Assisted Solution

by:Terry Woods
Terry Woods earned 250 total points
ID: 34200428
If the value "today" should be allowed by itself, then you want this pattern:

^\d{4}-(\d|0\d|1[012])-(\d|[012]\d|3[01])|today$

But that's not going to fix your problem - 2010-01-03 is valid with the pattern you provided, so there must be a problem somewhere else in the code. I'm not familiar with actionscript, so I won't be able to help any further probably.
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LVL 14

Accepted Solution

by:
tomaugerdotcom earned 250 total points
ID: 34212808
This is a total cop-out, but maybe you haven't done this yet. I'm going to paste in a working example that does exactly what you're taking about.

Do note that in this example, we use a couple more properties on the RegExpValidator declaration: valid, invalid and trigger. "trigger" is used to specify the component that originates the event that triggers the validator (in this case, dateBT).
<?xml version="1.0" encoding="utf-8"?>
<!-- Simple example to demonstrate the RegExpValidator. -->
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark"
        xmlns:mx="library://ns.adobe.com/flex/mx">

    <fx:Script>
        <![CDATA[
            import mx.events.ValidationResultEvent;
            import mx.validators.*;

            // Write the results to the 
            private function handleResult(eventObj:ValidationResultEvent):void {
                if (eventObj.type == ValidationResultEvent.VALID) {
                    // For valid events, the results Array contains
                    // RegExpValidationResult objects.
                    var xResult:RegExpValidationResult;
                    reResults.text = "";
                    for (var i:uint = 0; i < eventObj.results.length; i++) {
                        xResult = eventObj.results[i];
                        reResults.text=reResults.text + xResult.matchedIndex + " " + xResult.matchedString + "\n";
                    }
                } else {
                    reResults.text = "";
                }
            }
        ]]>
    </fx:Script>

    <fx:Declarations>
        <mx:RegExpValidator id="regExpV" 
                source="{regex_text}" property="text" 
                flags="g" expression="{regex.text}" 
                valid="handleResult(event)"
                invalid="handleResult(event)"
                trigger="{myButton}"
                triggerEvent="click"/>
    </fx:Declarations>

    <s:Panel title="RegExpValidator Example"
            width="75%" height="75%"
            horizontalCenter="0" verticalCenter="0">
        <s:VGroup left="10" right="10" top="10" bottom="10">
            <s:Label width="100%" text="Instructions:"/>
            <s:Label width="100%" text="1. Enter text to search. By default, enter  a string containing the letters ABC in sequence followed by any digit."/>
            <s:Label width="100%" text="2. Enter the regular expression. By default, enter ABC\d."/>
            <s:Label width="100%" text="3. Click the Button control to trigger the validation."/>
            <s:Label width="100%" text="4. The results show the index in the text where the matching pattern begins, and the matching pattern. "/>
            <mx:Form>
                <mx:FormItem label="Enter text:">
                    <s:TextInput id="regex_text" text="xxxxABC4xxx" width="100%"/>
                </mx:FormItem>
                <mx:FormItem label="Enter regular expression:">
                    <s:TextInput id="regex" text="ABC\d" width="100%"/>
                </mx:FormItem>
                <mx:FormItem label="Results:">
                    <s:TextInput id="reResults" width="100%"/>
                </mx:FormItem>
                <mx:FormItem >
                    <s:Button id="myButton" label="Validate"/>
                </mx:FormItem>
            </mx:Form>
        </s:VGroup>
    </s:Panel>

</s:Application>

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LVL 14

Expert Comment

by:tomaugerdotcom
ID: 34212823
Other than the canned code, it's hard to pinpoint where the error is because we're not seeing all your code. For example what's happening inside your dateTI_focusOutHandler function? And how do you know your validation is not working? You RegExpValidator is not triggering any events...
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LVL 37

Expert Comment

by:CyanBlue
ID: 34424439
This question has been classified as abandoned and is being closed as part of the Cleanup Program.  See my comment at the end of the question for more details.
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